vf_perspective.c File Reference

#include "libavutil/avassert.h"
#include "libavutil/eval.h"
#include "libavutil/imgutils.h"
#include "libavutil/mem.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "filters.h"
#include "video.h"

Go to the source code of this file.

Data Structures
struct	PerspectiveContext
struct	ThreadData
	Used for passing data between threads. More...

Macros
#define	SUB_PIXEL_BITS   8
#define	SUB_PIXELS   (1 << SUB_PIXEL_BITS)
#define	COEFF_BITS   11
#define	LINEAR   0
#define	CUBIC   1
#define	OFFSET(x)
#define	FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Enumerations
enum	PERSPECTIVESense { PERSPECTIVE_SENSE_SOURCE = 0 , PERSPECTIVE_SENSE_DESTINATION = 1 }
enum	EvalMode { EVAL_MODE_INIT , EVAL_MODE_FRAME , EVAL_MODE_NB }
enum	{   VAR_W , VAR_H , VAR_IN , VAR_ON ,   VAR_VARS_NB }

Functions
	AVFILTER_DEFINE_CLASS (perspective)
static double	get_coeff (double d)
static int	calc_persp_luts (AVFilterContext *ctx, AVFilterLink *inlink)
static int	config_input (AVFilterLink *inlink)
static int	resample_cubic (AVFilterContext *ctx, void *arg, int job, int nb_jobs)
static int	resample_linear (AVFilterContext *ctx, void *arg, int job, int nb_jobs)
static av_cold int	init (AVFilterContext *ctx)
static int	filter_frame (AVFilterLink *inlink, AVFrame *frame)
static av_cold void	uninit (AVFilterContext *ctx)

Variables
static const AVOption	perspective_options []
static enum AVPixelFormat	pix_fmts []
static const char *const	var_names [] = { "W", "H", "in", "on", NULL }
static const AVFilterPad	perspective_inputs []
const FFFilter	ff_vf_perspective

Macro Definition Documentation

SUB_PIXEL_BITS

#define SUB_PIXEL_BITS   8

Definition at line 32 of file vf_perspective.c.

Referenced by resample_cubic(), and resample_linear().

SUB_PIXELS

#define SUB_PIXELS   (1 << SUB_PIXEL_BITS)

Definition at line 33 of file vf_perspective.c.

Referenced by calc_persp_luts(), config_input(), resample_cubic(), and resample_linear().

COEFF_BITS

#define COEFF_BITS   11

Definition at line 34 of file vf_perspective.c.

LINEAR

#define LINEAR   0

Definition at line 36 of file vf_perspective.c.

Referenced by calc_max_draw(), checkasm_check_sw_ops(), distortion_correction_filter_slice(), filter_frame(), get_iscale(), get_scale(), init(), read16_fft_bin(), and read8_fft_bin().

CUBIC

#define CUBIC   1

Definition at line 37 of file vf_perspective.c.

Referenced by init().

OFFSET

#define OFFSET

(

x

)

Value:

offsetof(PerspectiveContext, x)

Definition at line 57 of file vf_perspective.c.

FLAGS

#define FLAGS   AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_VIDEO_PARAM

Definition at line 58 of file vf_perspective.c.

Enumeration Type Documentation

PERSPECTIVESense

enum PERSPECTIVESense

Enumerator
PERSPECTIVE_SENSE_SOURCE	coordinates give locations in source of corners of destination.
PERSPECTIVE_SENSE_DESTINATION	coordinates give locations in destination of corners of source.

Definition at line 60 of file vf_perspective.c.

EvalMode

enum EvalMode

Enumerator
EVAL_MODE_INIT
EVAL_MODE_FRAME
EVAL_MODE_NB

Definition at line 65 of file vf_perspective.c.

anonymous enum

anonymous enum

Enumerator
VAR_W
VAR_H
VAR_IN
VAR_ON
VAR_VARS_NB

Definition at line 121 of file vf_perspective.c.

Function Documentation

AVFILTER_DEFINE_CLASS()

AVFILTER_DEFINE_CLASS

(

perspective

)

get_coeff()

static double get_coeff ( double d )

inlinestatic

Definition at line 104 of file vf_perspective.c.

Referenced by config_input().

calc_persp_luts()

static int calc_persp_luts ( AVFilterContext * ctx, AVFilterLink * inlink )

static

Definition at line 123 of file vf_perspective.c.

Referenced by config_input(), and filter_frame().

config_input()

static int config_input ( AVFilterLink * inlink )

static

Definition at line 222 of file vf_perspective.c.

resample_cubic()

static int resample_cubic ( AVFilterContext * ctx, void * arg, int job, int nb_jobs )

static

Definition at line 276 of file vf_perspective.c.

Referenced by init().

resample_linear()

static int resample_linear ( AVFilterContext * ctx, void * arg, int job, int nb_jobs )

static

Definition at line 355 of file vf_perspective.c.

Referenced by init(), and resample_linear_TMPL().

init()

static av_cold int init ( AVFilterContext * ctx )

static

Definition at line 430 of file vf_perspective.c.

filter_frame()

static int filter_frame ( AVFilterLink * inlink, AVFrame * frame )

static

Definition at line 442 of file vf_perspective.c.

uninit()

static av_cold void uninit ( AVFilterContext * ctx )

static

Definition at line 484 of file vf_perspective.c.

Variable Documentation

perspective_options

const AVOption perspective_options[]

static

Initial value:

= {
    { "x0", "set top left x coordinate",     OFFSET(expr_str[0][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "y0", "set top left y coordinate",     OFFSET(expr_str[0][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "x1", "set top right x coordinate",    OFFSET(expr_str[1][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
    { "y1", "set top right y coordinate",    OFFSET(expr_str[1][1]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "x2", "set bottom left x coordinate",  OFFSET(expr_str[2][0]), AV_OPT_TYPE_STRING, {.str="0"}, 0, 0, FLAGS },
    { "y2", "set bottom left y coordinate",  OFFSET(expr_str[2][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
    { "x3", "set bottom right x coordinate", OFFSET(expr_str[3][0]), AV_OPT_TYPE_STRING, {.str="W"}, 0, 0, FLAGS },
    { "y3", "set bottom right y coordinate", OFFSET(expr_str[3][1]), AV_OPT_TYPE_STRING, {.str="H"}, 0, 0, FLAGS },
    { "interpolation", "set interpolation", OFFSET(interpolation), AV_OPT_TYPE_INT, {.i64=LINEAR}, 0, 1, FLAGS, .unit = "interpolation" },
    {      "linear", "", 0, AV_OPT_TYPE_CONST, {.i64=LINEAR}, 0, 0, FLAGS, .unit = "interpolation" },
    {       "cubic", "", 0, AV_OPT_TYPE_CONST, {.i64=CUBIC},  0, 0, FLAGS, .unit = "interpolation" },
    { "sense",   "specify the sense of the coordinates", OFFSET(sense), AV_OPT_TYPE_INT, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 1, FLAGS, .unit = "sense"},
    {       "source", "specify locations in source to send to corners in destination",
                0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_SOURCE}, 0, 0, FLAGS, .unit = "sense"},
    {       "destination", "specify locations in destination to send corners of source",
                0, AV_OPT_TYPE_CONST, {.i64=PERSPECTIVE_SENSE_DESTINATION}, 0, 0, FLAGS, .unit = "sense"},
    { "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, {.i64 = EVAL_MODE_INIT}, 0, EVAL_MODE_NB-1, FLAGS, .unit = "eval" },
         { "init",  "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_INIT},  .flags = FLAGS, .unit = "eval" },
         { "frame", "eval expressions per-frame",                  0, AV_OPT_TYPE_CONST, {.i64=EVAL_MODE_FRAME}, .flags = FLAGS, .unit = "eval" },
 
    { NULL }
}

Definition at line 71 of file vf_perspective.c.

pix_fmts

enum AVPixelFormat pix_fmts[]

static

Initial value:

= {
    AV_PIX_FMT_YUVA444P, AV_PIX_FMT_YUVA422P, AV_PIX_FMT_YUVA420P,
    AV_PIX_FMT_YUVJ444P, AV_PIX_FMT_YUVJ440P, AV_PIX_FMT_YUVJ422P,AV_PIX_FMT_YUVJ420P, AV_PIX_FMT_YUVJ411P,
    AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUV440P, AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUV411P, AV_PIX_FMT_YUV410P,
    AV_PIX_FMT_GBRP, AV_PIX_FMT_GBRAP, AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
}

Definition at line 97 of file vf_perspective.c.

var_names

const char* const var_names[] = { "W", "H", "in", "on", NULL }

static

Definition at line 120 of file vf_perspective.c.

perspective_inputs

const AVFilterPad perspective_inputs[]

static

Initial value:

= {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = filter_frame,
        .config_props = config_input,
    },
}

Definition at line 491 of file vf_perspective.c.

ff_vf_perspective

const FFFilter ff_vf_perspective

Initial value:

= {
    .p.name        = "perspective",
    .p.description = NULL_IF_CONFIG_SMALL("Correct the perspective of video."),
    .p.priv_class  = &perspective_class,
    .p.flags       = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC | AVFILTER_FLAG_SLICE_THREADS,
    .priv_size     = sizeof(PerspectiveContext),
    .init          = init,
    .uninit        = uninit,
    FILTER_INPUTS(perspective_inputs),
    FILTER_OUTPUTS(ff_video_default_filterpad),
    FILTER_PIXFMTS_ARRAY(pix_fmts),
}

Definition at line 500 of file vf_perspective.c.